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Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266446 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
3.0 KiB
LLVM
79 lines
3.0 KiB
LLVM
; RUN: opt %s -O2 -S -o - | FileCheck %s
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; Verify that we emit the same intrinsic at most once.
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; rdar://problem/13056109
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;
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; CHECK: call void @llvm.dbg.value(metadata %struct.i14** %p
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; CHECK-NOT: call void @llvm.dbg.value(metadata %struct.i14** %p
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; CHECK-NEXT: call i32 @foo
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; CHECK: ret
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;
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;
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; typedef struct {
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; long i;
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; } i14;
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;
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; int foo(i14**);
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;
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; void init() {
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; i14* p = 0;
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; foo(&p);
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; p->i |= 4;
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; foo(&p);
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; }
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;
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; ModuleID = 'instcombine_intrinsics.c'
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.9.0"
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%struct.i14 = type { i64 }
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; Function Attrs: nounwind ssp uwtable
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define void @init() #0 !dbg !4 {
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%p = alloca %struct.i14*, align 8
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call void @llvm.dbg.declare(metadata %struct.i14** %p, metadata !11, metadata !DIExpression()), !dbg !18
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store %struct.i14* null, %struct.i14** %p, align 8, !dbg !18
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%1 = call i32 @foo(%struct.i14** %p), !dbg !19
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%2 = load %struct.i14*, %struct.i14** %p, align 8, !dbg !20
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%3 = getelementptr inbounds %struct.i14, %struct.i14* %2, i32 0, i32 0, !dbg !20
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%4 = load i64, i64* %3, align 8, !dbg !20
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%5 = or i64 %4, 4, !dbg !20
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store i64 %5, i64* %3, align 8, !dbg !20
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%6 = call i32 @foo(%struct.i14** %p), !dbg !21
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ret void, !dbg !22
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare i32 @foo(%struct.i14**)
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attributes #0 = { nounwind ssp uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "instcombine_intrinsics.c", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "init", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "instcombine_intrinsics.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = !{i32 2, !"Dwarf Version", i32 2}
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!9 = !{i32 1, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.5.0 "}
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!11 = !DILocalVariable(name: "p", line: 8, scope: !4, file: !5, type: !12)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !13)
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!13 = !DIDerivedType(tag: DW_TAG_typedef, name: "i14", line: 3, file: !1, baseType: !14)
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!14 = !DICompositeType(tag: DW_TAG_structure_type, line: 1, size: 64, align: 64, file: !1, elements: !15)
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!15 = !{!16}
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!16 = !DIDerivedType(tag: DW_TAG_member, name: "i", line: 2, size: 64, align: 64, file: !1, scope: !14, baseType: !17)
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!17 = !DIBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!18 = !DILocation(line: 8, scope: !4)
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!19 = !DILocation(line: 9, scope: !4)
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!20 = !DILocation(line: 10, scope: !4)
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!21 = !DILocation(line: 11, scope: !4)
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!22 = !DILocation(line: 12, scope: !4)
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